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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1af31fda95408d02c7b4e33f053e50d636813a2c22a821c9fe2c6f6b99a0f3a' 
  AND token = 'k2VWrRzdOd68OdAsm8jVwU7GMRcJ2zxxRDDmwcXYwaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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