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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edac4c2cb75cbafc52de90f691184b3332398ad06d88860f1ff940d0ebff07bd' 
  AND token = '4DEYmHx6NxH9rJzVZar9QKIXDDJqHIUtHYZVIeZc7sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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