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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f208112e295168c15e7bb3d3877cf818d4367ed8f02c3e7b99f888599019c24e' 
  AND token = 'wG8y351ufKJ/lwgu8wS3ombYXCANGwqveYD4F49j3SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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