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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8f651368becc3654eda50ed3963d3015388df493a4bd3c73c67750ce8a2bb4' 
  AND token = 'Z8f0V0D0xHXy0VdyYP4lUDwH19yCozK40hPfnbD871E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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