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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b061da25a049747561b0ae16667d4e6c5a753a4abb445fbda245618757debe3' 
  AND token = 'WJ14kRYLdN1RA6JktM/gISl5P/lyGBPc8XQ4nG33WKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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