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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a22d03a15d21f54d450264e786adc676a841028d44cce359f4f426adf7a124' 
  AND token = 'xgCUyP9iq4FXfjHhoFnsM7dlPxRJn1HX1qfa3PNW7PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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