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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f120c84037654f488d5df7d27351ba0590b35ad7ca7bd30346179b0d27e5118e' 
  AND token = 'l56rt1h+QEw0GaJMavdJfp0Zs/RjaMnu99mP01jCGDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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