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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd997fcd6b686ec5dde7c52d4a0226c38d051e1b923d95dddce40a2eb9696c02' 
  AND token = 'IxgMpBMrGMdb05XM3/XBjRzal23bM16Wb7IVVFjWMJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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