SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb12e569b1d7ca3e3016c95533c57d74d470c671a887af28b4295f2fe7aaf3dd' 
  AND token = 'x+rDuXuVGPOUfv0Di2OxQ6QUxIE/YD+K7+OVBYBsXis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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