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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178b924429c68403e63ad26f75dcf6fa3a91f5e68a7d2e7db796d96fc42a15dc' 
  AND token = 'rarw7S7/8MMIi2zGJup3kEROm35nEg/a0lljqImrkM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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