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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2216285de9623a70a283376df5af92c5a073b1f6472b9c99cbdc288021828c' 
  AND token = 'M34EFPJOu0C1YkTglyQx5mNEIPdpJLfV8wJNrRFLYOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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