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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6309b700899ac26c3fcb0eb2d9f89fbf3f5ea38130c978bbe5e7948a4ee58e' 
  AND token = 'mER8i7hoKkL+Qx/55wAB470hqSsUtlEvKp9TsZYyiEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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