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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88c8fd8e0d79ebe0cb777dde4bd1fb1650f5a2b6fae4919f77b6abb0dd1bf2b' 
  AND token = 'wSBNrvlBwc3jRZ8MqpMHi5lrnCdTmwmOO+El/dLiNr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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