SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b99ffbd3ea1a37b7f2d7cacf3caf5966c2a915c508139caf944fe80c61a9f3' 
  AND token = 'pj/C19GqgJIT3FubWkCna9BL8G1YwFYku+hghBx8wb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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