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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2dfed3746715efb89143d1b6d632e4e5f8db2100bc7ed23e494342e08858c8' 
  AND token = 'Ab+05ZVdokN7XXfnMqX9HH6Vys94Srxtcgt5byr5IIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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