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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d986089f85d682e9538e6df22c6f05204bc590235e6a4b0cc42d4f29c11921a' 
  AND token = 'WA+lGVK1+fL5jv1hnb/XpHndGPdImA8SetxGPagjaIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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