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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786d82d2badd832a3ad5f96e469a81ebb04af3ecf32eaffd7c85482fa85e06df' 
  AND token = '6VPfWkENUo1HVMLf4fFdgiQtt7S9QGWp8TNYfBxdGAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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