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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3632ab8eb91cd7d610c03e30929807e48e03dee3bfcf123075c55fe5b51ce78d' 
  AND token = 'uvXmfLAe3BLQMSwN8+MuehxvvTTgwgaoinVAxhO/XK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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