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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f96f80f091994dfffb3dac7168e89d715abdd607d61aeaaf1af098f13f6818' 
  AND token = 'cFMMEiWlMuGgpFyN35GCTLs4bZ9g1nTkYAz99CDostU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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