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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9248cf62c543df8406a3d4a2cf88443444f96edd1d2f45e67a26d7f0d4a9776a' 
  AND token = 'uc00tj7EUug2ojDrjRpFvBRJEjwr0q0DVl1PWpZqDEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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