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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df9d56db68c5c76c6bd6e44fe5a6217b4336df95307c6bf5663a9bd00e94b86' 
  AND token = 'L/wFOhL5SKLCbFF+KrklHQKV4/L0V6tco63jD3AC8zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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