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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a6f5522cd7bb5c6267297c40ca08642fe58d60a55ee383c7b387216f0993d4' 
  AND token = 'UUtXDgRZgxswI6L8ywYUOPcGA+B79b/9l0kKUkA2x+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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