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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e968f37caba1288ad0071d825862c857666b68ba2acebec41a602f27244f024' 
  AND token = 'qBUQLh8i+FNbd9nQQSQiIiry4MthXmA3EiZOXyHHq6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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