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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23dbaacd4fb74c6e9bdf63bb9ce0b5d4bbc67f5f638be4f395c485ffda1aed7' 
  AND token = 'MNY+t2ENmR4H/hORFp6lxd0MexhqP5va3rfgbvIBU0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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