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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13c7dbc5bb3d1731e2be41856bb191118d25b6fa407849598fb1936fc34ced0' 
  AND token = 'KEHad0rGkbiltDmd3j6n9N1exSzdIcT+Yn4BEAMJZ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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