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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f97d40552bfe6e59380e915ed59fd9e66e933835f495fc38dcaa65c4f6e7c69' 
  AND token = 'jFaotsjmT+lProaUiRI7JKLh+/tEKhL4eGUluL8kD7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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