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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ee410fa66a889958ee32f26689f936fe1406e9822e8f84a26283b5eef41eae' 
  AND token = 'AgfQTUiaOFwFKSCoi2GuRf4M6gxc138B4mjJWRcp61E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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