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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3eb7e581969e1b764540c888119fecde5da3f13d158e79aab5beb63ae91181d' 
  AND token = 'LIZoQRHWk3aFktNQ9irh167HhMisl8tROVOAaJquzZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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