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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f5258ad763693e50892e72a34ad2701056b35ac7c6c9859ba89bedf09b1707' 
  AND token = 'F92etXKdXtE5joKIkyWy6hkI94qHJYUCRR9jmc2ZOQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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