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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91b4478b67744e1ebc604f8dbe421314160213e538ff2323c0c06f14ff4465c' 
  AND token = 'FiVRbvhkT7bsobaptDPmSxM3FDncQVfg+74hAwZEl5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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