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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3345d21178ad0ebbb3f3923e2c67bbb27a42224cc7e185d0d4387ed457444d3' 
  AND token = 'k88QjBx95ARTsEcvL2gUxe7Z/P5euI9xK31HnVaHJLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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