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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fb2988d6a7567ccefed5381cdbc4a5f6c73e0e32130d3a876c52a8c54bf4eb' 
  AND token = 'W76B7O4aWlF32FyKQK78X3Lg/bG4fRWMeddwWDKTJOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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