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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cdbb65ccc1b5cfc4cbd7e54e83c5f08a1e6e1f7fd40e4d9e0ac5ff22d1b2b2' 
  AND token = 'sGZ9CFKy1PrhWsNav6gwcj/SAqcpVkbXEDsBr/O8AOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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