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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbfee40ed584dd754d7bfcd7fad1170d46702fd6ed04139f7709d6dac708f69' 
  AND token = 'VJndLzHrvhy7NZWQe0jiDFuzOskmNSYEBq9tn/L8q3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}