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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87774e7d1d37e6d3fa66741adb80fc05cd740df69fadadaee33816b3919c4875' 
  AND token = '2qQa1hOSzcbhc0F6FoLD02N6SmIZ/gxv4PI1eUVe3G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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