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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b84a316971118bfae6784ad1a4b8bd2a6f2fdd3449d45d26a74018b5bf9c26' 
  AND token = 'kuqyWZN+eWMdBS2O6bGx28HojB73LglEgT7ns/rP1Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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