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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63123e38b7dd01169e12e0d2edf6e00feb7323cc4e9dbebda526affb35da1bd' 
  AND token = 'mQ3NKEvjj5aEWUDzO2s0V6ooErCU1EspRPijjqmLheY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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