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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78faa4d7167b5092191eb73ccaf105a3db25580b6071969995af62359ce46c11' 
  AND token = 'q6M02fgwNyeYBHN6S1fY+u4+kddZ8wj9+2qkGcQ5vBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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