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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fbd8a14212b38b3c2802bb04d6f74418bebd21d36f46ebf4768133dcce4503' 
  AND token = 'n8mlAViTQDKONDT1cLmIuyyg3vZBZo0cZuPcLYp+zRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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