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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e894dc7c29213b62a5a672526974bb671111f92f7575b773e68d254c47e5d7f4' 
  AND token = '5pUZWJnuii0LLEEPzwaUv8zymjC2fs9Z0fH18gMBwCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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