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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cf083d215d211d64e1852c02a4374b9a659e80dd373fc0b2d18c9987a70e2f' 
  AND token = 'ceKvin3m/f1hb8ktRJJP6AKANqHnNV9wqL9Htw+Fyrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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