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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3277d7f15c8f575c01faa4870ea86d5d574d761b28d724e8615194be7c962f' 
  AND token = 'aYfA2v2HZHs3ucg2UujcXAuXVI32NAYXW2FNIlY3f+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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