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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9f4599a2973caa355673595f759c582978d40d2b8b152200a2955afcb6dc54' 
  AND token = 'gNJW3SdniljQ9aiqhGoLJJcZl9b09jTWzYMS3M91k+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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