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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de82ff9373ec234ca9b1ba2897bf242d84974ec906f8ba541b58955fce3289fd' 
  AND token = 'OmSvCD5kMFkao1PU1Ww7O+eH5FlOm9l1QJX3n2bpT4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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