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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc5cefa8f9bf9b565f01d96c82b3169762c195ea76089d21312210f5d03b1d7' 
  AND token = 'gganCC1nn6fx/hG2llgZOVJwdzS4wqIneVbe900yepc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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