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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b107de1c6951bef69b5b4a0d18885b1771cc598b7dd46717b7228680a5774194' 
  AND token = '6dHvZsCLcpz5E+zlz1iaI+u3TkCQS5H/zJFXTtkUyNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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