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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c34b5a2abd00f45dd7474dd69e792aad108d0ba009c5684b5e647f1202f099' 
  AND token = 's4sLSYVoNXcCFWyJx39Dcj/uYY0AiFOZx/iX+WLjtw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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