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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acaafd0e831737bfe8fddfb841b1177d962eb55401687b55aa6b491aff07c28d' 
  AND token = 'h2X4dJcYnHFwyo55djJQRcEYNiznGj6bsoVCYVSzpAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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