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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81b55da1ce01cf1f11d3922fd7997bacfbe41fce46d6649028745ff9da36bce' 
  AND token = 'MEyW4O2+16yRPzelV+HzJadOVW0gSctrMK+eM4oHdUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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