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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7e395ae2b5103048ad1d08cc9721e7da37809d98aac108762f2417cb96e932' 
  AND token = 'sI+4hwGrtpPXxsltkiF2j87214FjVeYcOpDggUfReLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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