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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61668b6432cea00ce6fd5d44d16a7c4a510988a704834a517952178e3c64d3e0' 
  AND token = 'FtOpvxSuD1HYEuonh5NftlIWCAHWNTvU7W6qzYe0V0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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