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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d94f7908b647358f35bab4e4650530b66f649d2f77978966f92309c61b5284' 
  AND token = '3Urjh4UyzWc0i4SHOPUnwk2KuzNWAWyxlvnAuB58pYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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