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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0911755b46b265140d3964794aaddb1e2418d5caf8154fa3fd4eb0752511a1d' 
  AND token = 'FUi+isNBMKji2oswZhr9V1LodDDylLZVhK260E5s1Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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