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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f6aacde8ea1424f17fb32b1a1149cea5b4ad1e1a3d1f9ee6877837d9bab9bc' 
  AND token = 'aR4PyC239XQm8GS1bBv6CBjBt1idZX/1IaEgGzXcwgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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