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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb230d127434944323395045c73eac6a90c6579b1c2bf7990831653134c53b0a' 
  AND token = 'aIKwFvohyyhHd6vbz4JTpoKE56BlhunXImmdUWtdRoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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