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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf26f0090f971fedda4ceb73017018b6161adf34e4e30c860c35344628cfc40' 
  AND token = 'zT7Auq1LIC9FIl0l3Iq4anMdTLyovLmkTggSop5E3vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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